4 Lesson: BIO.A.4.2 Homeostasis

Homeostasis

Homeostasis is maintained by negative feedback (stay by target) loops and positive feedback (go beyond target) loops 

Receptors: Detect stimulus

Effector: Change

Feedback Loops

• Regulation of a stable internal environment in our bodies.

• Positive Feedback: Blood clotting, childbirth, digestion, nerve signals (End products of an action cause) (away from the target)

• Negative Feedback: (sugar in blood) triggers insulin to be release to remove glucose from blood) (inhibit action from continuing) (stay by the target)

Homeostasis: Thermoregulation

• Thermoregulation is a process that allows your body to maintain its core internal temperature

• Heat can be exchanged between an animal and its environment through four mechanisms: radiation, evaporation, convection, and conduction

• 
  

Multiple Choice

The name for a chemical made by glands that tell cells to make something or respond in some way.

• acid
• enzyme
• perspiration
• hormone

Multiple Choice

The "effect" of a given stimulus is the...

• response
• stimulus
• cause
• result

Multiple Choice

The "cause" for something to happen is the

• response
• effect
• stimulus
• homeostasis

Multiple Choice

Maintaining body temperature is an example of a:

• negative feedback loop
• positive feedback loop

Multiple Choice

The two types of feedback systems that help organisms maintain homeostasis are:

• positive and negative 
• receptor and effector
• static and dynamic
• minor and major

Multiple Choice

Failure to maintain homeostasis could result in:

• lack of internal balance
• eventual death
• difficulty carrying on metabolism 
• all three

Multiple Choice

According to the feedback loop, what does high blood sugar promote?

• Insulin Release

• Glucagon Release

• Insulin Uptake

• Glycogen Uptake

Multiple Choice

In this body temperature feedback loop, predict what would happen if cooling mechanisms were NOT activated?

• The body would not warm up.

• The body would not cool down.

• Your body would get colder and colder.

• Your body would release lots of heat.

Multiple Choice

A feedback loop best fits which characteristic of life?

• Cells

• Organization

• Homeostasis

• Adaptation

Multiple Choice

which of the factors not affecting the internal environment?

• Temperature
• Respiration
• pH value
• Osmotic pressure

Multiple Choice

Homeostasis

• allows for a wildly fluctuating internal environment

• is impossible in vertebrates

• is the maintenance of a relatively stable internal environment and often incorporates a form of feedback regulation

Multiple Choice

What is involuntary contractions of voluntary muscles to warm up?

• Shivering
• Sweating
• Vasodilation
• Vasoconstriction

Multiple Choice

What is a disease where sufferers cannot control their blood glucose levels?

• Diabetes
• Influenza
• Cholera
• Cystic fibrosis

Multiple Choice

Which body system controls the body to maintain homeostasis?

• excretory

• nervous

• circulatory

• skeletal